KR100258637B1 - A sewage disposal method - Google Patents

Abstract

PURPOSE: A sewage and wastewater treatment method is provided, which can treat organic matter, nitrogen and phosphorus efficiently by adopting a new treatment method utilizing the merits of intermittent aeration of sludge at reactors operated by only ON/OFF of air supplying system and the merits of continuous batch reactor. The method eliminates necessity of effluent device and settling tank. CONSTITUTION: The method comprises the following steps: (i) feed sewage to the treating system that consists of a reservoir (1), a No.1 reaction tank (2) and a No.2 reaction tank (3); (ii) repeat aeration and non-aeration alternately at the reactors (2,3) for a fixed time, the aeration being for nitrification, intake of phosphorus and oxidation of organic matter, the non-aeration being for denitrification oxidation, release of phosphorus and intake of organic matter; (iii) settle the sludge that is a grown microorganism, and transfer sludge to the adjacent reactors (2,3); and (iv) discharge the purified water through effluent valve, the feeding and discharging being repeated.

Description

Wastewater treatment method

The present invention relates to a wastewater treatment method, and in particular, to change the operating factors of the wastewater reactor to effectively treat the organic matter and nutrients nitrogen and phosphorus, and to facilitate the discharge of water to the internal circulation without sedimentation tank.・ It relates to a wastewater treatment method that can effectively treat wastewater.

Nitrogen and phosphorus, nutrients resulting from sewage and manure, generally enter streams and lakes without proper treatment at the place of production. The introduced components cause eutrophication, which is a major factor in algal abnormal growth, and eventually acts as a major obstacle to the management of valuable water resources such as rivers and dams, and thus, when the water is taken as raw water and purified, It will cause many economic losses such as increase.

In general, the conventional water treatment technology associated with most purification facilities including domestic sewage treatment plants uses more than 98% of activated sludge systems that aeration for 24 hours with or without contact media.

In particular, sewage treatment is operated as an activated sludge system in the form of long-term aeration, but this treatment method converts organic and ammonia nitrogen into nitrite or nitrate nitrogen form only in the case of nitrogen, and can not expect a final treatment. The treatment efficiency of phosphorus is also low, and it is pointed out as a big problem in water quality management of water supply protection area including upstream of dam.

In addition, most of the septic tanks installed in homes, buildings, and the like are treated only with organic matter, and have a lot of economic burden because they continuously aeration for 24 hours.

As a newly developed technology, various biological treatment methods for treating nitrogen and phosphorus are used depending on the type of operation. Examples of such operating forms include the Bardenpho, A / O, and A ² / O methods. However, the above methods are disadvantageously economically burdened because organic materials must be supplied from the outside in order to more effectively remove nitrogen.

Recently, the operation method of intermittent aeration type, which is effective for the treatment of nitrogen, has been developed as a dynamic operation that changes the inflow direction of the influent and the operation method of the reaction vessel over time, away from the conventional operation method as described above. When applied to household septic tank, there is a problem such as difficult operation management and maintenance.

In addition, the existing continuous batch reactor operation method, which is used as a small-scale sewage and wastewater treatment technology, is operated under anaerobic conditions in which air is not supplied to the reactor for a certain time period, and then is again operated under aerobic conditions for supplying air for a certain time. After repeating the anaerobic and aerobic conditions, the grown microorganisms are precipitated to release purified water.

However, the continuous drinking reactor is usually a single reactor, or when the treatment capacity is large, a single reactor is connected in parallel to operate, it is found that the treatment efficiency of organic matter, nitrogen and phosphorus is also relatively excellent. However, in the step of discharging, it is necessary to pay close attention so that sludge does not come up or require an expensive discharge device, and when the organic matter is insufficient, there is a problem in that the treatment efficiency is lowered.

Therefore, the development of a wastewater treatment process that can effectively treat organic matter, nitrogen and phosphorus in sewage and manure, and can reduce the operating costs and facilitate management, the present invention is to achieve this, the reactor The present invention provides a process for treating wastewater and wastewater that can effectively remove the nitrogen and phosphorus in sewage and manure by adjusting the arrangement of the reactor and the operation method of the reactor, and improve the efficiency of operation and management. There is a purpose.

1 to 4 are schematic views of a waste water treatment process system according to the method of the present invention.

5 is a view showing a structure for preventing the release of floating foreign matter in the waste water treatment system according to the method of the present invention;

※ Explanation of codes for main parts of drawing

1: Storage tank 2: First reactor

3: second reactor 4: inflow pump

5: Return Pump 6: Outflow Pump

7: transfer line 8: diffuser

9: blower 10: solenoid valve

11 stirrer 12 contact material

13: scum and floating foreign matter

In order to achieve the above object, the present invention is a wastewater treatment method that improves the structure and operation method of a conventional continuous batch reactor, and does not require a separate sedimentation tank, and greatly reduces the capacity of an air supply device by half compared to a conventional continuous batch reactor. As a technology for reducing treatment and improving treatment efficiency, the present invention arranges a storage tank in which O. waste water is stored, a first reactor, and a second reactor in series, and installs an air supply and an agitator in each of the reactors to supply or supply air. Configuring the mixing to take place alternately, introducing wastewater from the storage tank into a treatment facility including a reaction tank; By using the air supply and the stirrer, the aeration and non-aeration states are alternated in each of the reaction tanks at a predetermined time interval from the completion of the inflow of each sewage so that nitrification, intake of phosphorus, and oxidation of organic matter are performed during the aeration time, and the non-aeration time. Biological reaction step for denitrification, phosphorus release and organic matter intake;

By using the air supply and the stirrer, the aeration and non-aeration states are alternated in each of the reaction tanks at a predetermined time interval from the completion of the inflow of each sewage, so that nitrification, intake of phosphorus, and oxidation of organic matter are performed during the aeration time. Biological reaction step for denitrification, phosphorus release and organic matter intake;

A settling and sludge conveying step of stopping the operation of the air supply and the stirrer and transferring the sludge to the adjacent reaction tank to facilitate the discharge while precipitating the grown sludge;

A discharge step of discharging the purified water for a predetermined time through an outlet valve attached to the final reactor;

After the completion of the discharge step is characterized in that it comprises a step of repeating the process starting from the waste water inflow step described above.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view showing a treatment system applied when treating wastewater with relatively rich organic matter, and the wastewater treatment process and its operation method will be described in detail.

First, the first step is an inflow step, and the stirring is started using the stirrer 11, and at the same time, the inflow water is introduced using the inflow pump 4 within a predetermined time, for example, within 1 to 2 hours. It is supplied to the 2nd reaction tank (3).

The second step is a reaction step, in which only the first reaction tank 2 and the second reaction tank 3 are stirred for 1 to 2 hours from the completion of the inflow of the influent. At this time, the sludge is continuously conveyed from the second reaction tank 3 to the first reaction tank 2 using the return pump 5, and the reaction causes denitrification and release of phosphorus.

After the anoxic reaction for 1 to 2 hours, the solenoid valve 10 is alternately injected into the first reactor 2 and the second reactor 3 at intervals of 0.5 to 2 hours to operate in the form of an intermittent aeration. The reaction results in partial nitrification and denitrification and phosphorus absorption and release.

Each reaction time of the second step may be effectively adjusted according to the characteristics of the wastewater.

The third step is the settling and conveying of sludge. When the reaction of the second step is completed, the power of the stirrer 11 and the air supply system 8, 9, 10 is turned off and the sludge for about 1 to 3 hours. Precipitate.

At this time, the sludge in the second reaction tank (3) is transferred to the first reaction tank (2) as much as possible by continuously transferring the sludge precipitated from the second reaction tank (3) to the first reaction tank (2).

The fourth step is a discharge step, in which the outlet valve 6 in the second reactor 3 is discharged for a predetermined time, for example, 0.5 to 2 hours.

FIG. 2 is a diagram showing a treatment system of the present invention to be applied when organic matters are treated to somewhat less wastewater.

Referring to the drawings, the first reaction tank 2 is provided with only the stirrer 11 without installing an acid pipe 8 to operate in anoxic and anaerobic conditions to cause denitrification, phosphorus release and organic matter oxidation reaction. The second reactor (3) is to continuously supply air to operate in an aerobic state to cause nitrification, intake of phosphorus and oxidation of organic matter.

The nitrification in the second reactor (3) is sufficiently nitrified, the waste water of high nitrate nitrogen is transferred to the first reactor (2) through the transfer pump (5) and denitrified, such nitrification, denitrification and absorption of phosphorus, The discharge is continued by sludge conveying.

As described in the operation method of FIG. 1, the operation method of FIG. 2 is the same as the inflow water supply method in the first step, and in the reaction step in the second step, for example, an anoxic reaction of 1 to 2 hours from a time point when the inflow water supply is completed. After this, the first reactor 2 is not supplied with air, and the second reactor 3 is continuously operated with air, and the three stages of sedimentation and sludge transfer are carried out, and the fourth stage is discharged. Is the same as the description of FIG.

FIG. 3 shows a high concentration of organic matter, nitrogen and phosphorus by filling the contact materials 12 such as a medium or a carrier in the reaction tanks 2 and 3 to maintain high concentrations of suspended and adherent microorganisms in the reaction tanks 2 and 3. It is a treatment process that is effectively applied to wastewater treatment and its operation method.

In this case, the wastewater treatment process and its operation method are the same as those in Fig. 1, except that only the contact member 12 is filled.

4 shows a high concentration of organic matter, nitrogen, and phosphorus by filling the contact materials 12 such as a medium or a carrier in the reaction tanks 2 and 3 to maintain a high concentration of suspended and adherent microorganisms in the reaction tanks 2 and 3. It is a treatment process that is effectively applied to wastewater treatment and its operation method.

The wastewater treatment process and its operation method are the same as in Fig. 2, except that only the contact member 12 is filled.

5 is a view showing a structure for preventing the discharge of floating foreign matter in the wastewater treatment system according to the method of the present invention, (a) is the discharge initial stage, (b) discharge end stage Each is shown.

That is, the structure shown in the figure is a structure for preventing the sludge from rising to the water surface or floating foreign matter is released as it is in the discharge step of purified water.

As shown in FIG. 5, the structure of the outlet portion is constructed by installing a pipe connected to the outlet valve 6, so that the floating foreign matter 13 including a scum floating on the water surface after discharge is completed. It is a structure to prevent leakage.

The outflow apparatus of FIG. 5 may be applied to all the processes of FIGS. 1,2,3 and 4.

Meanwhile, as an embodiment of the present invention, after the treatment process is configured as shown in FIG. 1, the wastewater treatment is performed under the following system operating conditions.

In other words, the chemical oxygen demand (COD, manganese method) is 30-150mg / L, total nitrogen (TN) is 40-70mg / L, the total phosphorus (TP) 1-5mg / L experiment to purify sewage The chemical oxygen demand (COD, manganese) was operated at 30 minutes of influent supply time, 2 hours of anaerobic reaction time, 6 hours of intermittent aeration reaction time of 1 hour, and 2 hours of settling time. The removal efficiency of the method) was 90% on average, and the removal efficiency of total nitrogen (TN) and total phosphorus (TP) was 80% on average, respectively.

As described above, the wastewater treatment method according to the present invention applies the advantages of the intermittent aeration activated sludge system operated by the on / off of the air supply device in the reactor and the advantages of the continuous batch reactor. As a new treatment method, it is excellent in the treatment efficiency of organic matter, nitrogen and phosphorus, and because it does not require a separate discharge device, the operation is simple, inexpensive, and the intermittent supply of air almost eliminates the cost of air supply. It can reduce about 50% and it takes less site and facility cost because there is no sedimentation tank.

Claims (7)

In the wastewater treatment method, After arranging the storage tank in which the waste water is stored, the first reaction tank and the second reaction tank in series, and installing an air supply and a stirrer in each of the reaction tanks so as to alternately supply or mix air, Introducing the sewage from the storage tank into a treatment facility including a reaction tank; By using the air supply and the stirrer, the aeration and non-aeration states are alternated in each of the reaction tanks at predetermined time intervals from the completion of the introduction of each sewage, so that nitrification, intake of phosphorus, and oxidation of organic matter are performed during the aeration time. Biological reaction step for denitrification, phosphorus release and organic matter intake; A settling and sludge conveying step of stopping the operation of the air supply and the stirrer and transferring the sludge to the adjacent reaction tank to smoothly discharge the sludge which is grown microorganisms; Purifying water discharge step of discharging the purified water for a predetermined time through the outlet valve attached to the final reaction tank; Waste water treatment method comprising the step of repeating the process starting from the inflow step again after the completion of the purified water discharge step. The method of claim 1, After only agitation in an oxygen-free state for a certain time, the operation of the air injection is alternately set in the first reactor and the second reactor for a predetermined time, and the sludge is returned from the second reactor to the first reactor at the same time as precipitation, Waste water treatment method characterized in that to discharge the purified water. The method of claim 1, After only stirring in an anoxic state for a certain time, the first reactor is operated without supplying air, and the second reactor is operated with air supplied to precipitate and sludge in the second reactor. Waste water treatment method characterized in that to discharge the purified water after returning to the first reaction tank. The method of claim 1, After forming a treatment process for filling a contact material such as a medium or a carrier and performing stirring only in an anoxic state for a predetermined time, air injection is alternately set in the first reaction tank and the second reaction tank for a predetermined time and operated. At the same time, the sludge is returned from the second reaction tank to the first reaction tank and then the purified water is discharged. The method of claim 1, After forming a treatment process filled with a contact material such as a medium or a carrier and performing stirring only in an oxygen-free state for a predetermined time, the first reactor operates without supplying air, and the second reactor supplies air. The waste water treatment method, characterized in that by operating in a state to discharge the purified water after the sludge is returned from the second reaction tank to the first reaction tank at the same time. The method according to any one of claims 1, 4 and 5, Wastewater treatment method characterized in that the wastewater is used as an anaerobic reactor to improve the treatment efficiency of phosphorus and reduce the amount of sludge generated. The method according to any one of claims 1, 4, and 5, The waste water treatment method characterized in that the structure of the outlet portion consisting of pipes connected to the outlet valve to discharge the treated water so that scum and floating foreign substances are not discharged.

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